Has anyone ever dyno a bike with T-boost?

[firefly]

Its been going around that using the T-boost @ 3k is no different than stock 6k, the only info on this subject is at Lvlhead website, all other opinions are based on that! has any one else actually dyno a bike in both mods? I know everyone reads it and believes without questioning??? this is by no means doubting his knowledge and experience but just to double check maybe 3-6 dyno runs with different bikes would confirm or prove wrong.
I have and sometimes used the T-boost 3k-6k switch and notice significant rush of power and acceleration, this is a definatly measurable difference, if you feel it by the seat of the pants it must be measurable?
our body can detect the difference.
I know some that have T-boost are not satisfied with it and want more & choose to go with more intrusive mods like stage 7 to infinity.

I did some tests with it, used it at 3k for a week of surface street riding
took the plugs off, all were slight tan of equal shade.
another test is going stock 6k then removing plugs to inspect color
basicly slight tan all plugs.
this means the bike is not going lean or rich?
Now these tests were not drag racing or open road long rids.

can someone with first hand experiance comment about that?
Thanks

 

[Buster Hymen]

Here is a cut and paste from Jon at UFO Cycle who dyno'd a stock bike with T-Boost.

> We have dynoed a stock Max with zero mods except opening the v-boost with
> a "t-boost" switch @ 3k. The Yamaha engineers know what they are doing. You do not have enough piston speed @ 3k rpm to use the additional fuel >available by sharing carbs when the v-boost opens . What happens is the bike runs rich between 3 and 6k and you will actually lose 9 hp and 10 # of >torque.
> If you replace the stock exhaust with a good free flowing system you can even
> keep the v-boost open all the time and will have nice hp and torque gains. Not
> my opinion......dyno facts. Jon.

There you go, dyno proof you will be down 9 HP.

 

[firefly]

Ok if it becomes rich wouldn't it show on the plugs?
what is piston speed? are we talking about the amount of air sucked by each cylinder? can you please elaborate? I am trying to get a better understanding on this subject, what causes the acceleration? if you loose 9 to 10 Hp that should slow down the bike not cause it to accelerate?
doesn't the vboost butterflies permit more air with the increase in fuel?
granted the amount of air at 3k speeds will be less that at 6k so the bike will get momentarily rich until it gets enough air @ about 4.5k on, so it is not as efficient but not too bad to foul a plug or even make it darker in color. am I missing something?
remember we are discussing and trying to get a better understanding.

Who else bike owner not bike business tried to dyno a bike? a business could be biased to sell more expensive mods + tuning + tuning + more mods + tuning again and so on.

Thanks

Here is a cut and paste from Jon at UFO Cycle who dyno'd a stock bike with T-Boost.

> We have dynoed a stock Max with zero mods except opening the v-boost with
> a "t-boost" switch @ 3k. The Yamaha engineers know what they are doing. You do not have enough piston speed @ 3k rpm to use the additional fuel >available by sharing carbs when the v-boost opens . What happens is the bike runs rich between 3 and 6k and you will actually lose 9 hp and 10 # of >torque.
> If you replace the stock exhaust with a good free flowing system you can even
> keep the v-boost open all the time and will have nice hp and torque gains. Not
> my opinion......dyno facts. Jon.

There you go, dyno proof you will be down 9 HP.

 

[shawn kloker]

I would also like to see some more runs(on & off).I didn't like my tboost but many seem to.

 

[firefly]

I think I read a recent post by paul that with tuning it can be satisfying,
remember its only $45 easy mod and for most it seems to be the just the kick they need occasionally want to go back just flip a switch.
But for others that want a 300hp max nothing will satisfy.

Put some criteria and I will try again x # of days and see, I don't know of any dyno place here but if I find one close I'll may try it.

I also here about corrected and non corrected values and that different dynos give different results?

I would also like to see some more runs(on & off).I didn't like my tboost but many seem to.

 

[shawn kloker]

Dyno jet has a dyno locator on their website.It will show you every location in california.Mark up at factory pro also has a dyno but he is up in san francisco.He is the owner and seems to know bikes very well.I also always wondered why Thomas Powell never dynoed one with his tboost to post the results.I am guessing that they are disapointing.
Tboost would not effect track times because they are full throttle runs after the launch,I like to launch at 6500rpm.

 

[mikemax04]

Here is a cut and paste from Jon at UFO Cycle who dyno'd a stock bike with T-Boost.

> We have dynoed a stock Max with zero mods except opening the v-boost with
> a "t-boost" switch @ 3k. The Yamaha engineers know what they are doing. You do not have enough piston speed @ 3k rpm to use the additional fuel >available by sharing carbs when the v-boost opens . What happens is the bike runs rich between 3 and 6k and you will actually lose 9 hp and 10 # of >torque.
> If you replace the stock exhaust with a good free flowing system you can even
> keep the v-boost open all the time and will have nice hp and torque gains. Not
> my opinion......dyno facts. Jon.

There you go, dyno proof you will be down 9 HP.

I like Jon already because he tells it like it really is. Too bad his words will soon be forgotten and the rage will continue. Several points I would like to touch on.

One, unless your bike is really running bad and way out of adjustment, plugs will take a long time to show how the bike is really tuned. This is a simple "try it yourself" project where you replace any two plugs with new ones and observe the difference with time.

Two, Yamaha decided to run a certain size carb on the Max for performance and also pleasure riding. Bigger carbs will give more hp but will also use more gas. Same situation with car engines before FI. Many had a two barrel which gave good mileage but not so good performance so the factory went to a four barrel for that extra boost when needed. Good carbs are complicated because they have to perform good at any RPM. FI is computer controlled and adjusts the fuel flow according to the engine's needs. The V-Boost was engineered to act like a 4 barrel carb in higher RPM's.

Three, piston speed is the actual speed that a piston travels in an engine. At cranking speed, it travels the slowest and as the engine's RPM rises, so does the piston speed. With increased RPM's, the engine takes in more air and needs more gas for a combustible mixture. Below 6K, the carbs on the Max are sufficiently big enough to handle the air/fuel mixture VOLUME per each cylinder. Above this RPM, the original carb would be too small to supply enough mixture that each piston needs and so the boost adds another carb to help supply the quantity of mixture needed above 6K. The reason the second carb helps, is because it's not supplying it's own cylinder at that moment with mixture. Remember this is a four cycle engine and each carb is only used once in four strokes/cycles.

Four, acceleration is the opening of the throttle valve in the carburetor. The engine RPM is regulated by the amount (volume) of air/fuel mixture we let it have. If there was no restriction of mixture, engines would automatically attain their maximum RPM where they would self destruct. Just like each cylinder can produce say a 10:1 compression, on the intake stroke it needs to fill the cylinder with mixture. The speed at which the piston travels is controlled by the opening of the carb throttle valve.

I will be glad to answer any questions on this subject that I failed to clarify above.

By the way, I have a T-Boost that can be had for $20+ shipping. Not sure if I still have the instructions for it but I think they are even displayed on the Web at V-Max Outlaws, where this unit was purchased.

 

[Rusty McNeil]

I've made a lot of runs with V-boost operating normally and with V-boost wired open full time. The dyno might see the difference but my times are pretty consistent either way.

Seat of the pants to me it has better low end response/torque with the v-boost in place and working properly but I think? it pulls harder midrange 3-6k with it wired open.....it's all speculative for me tho'
I currently run with butterflies wired completetly open and gutted, very free flowing exhaust....It does not run rich...spot on at 14.7:1 at steady throttle and around 12:1 at full acceleration

Rusty